What resources or documentation can be helpful when working with regular expressions in PHP?

When working with regular expressions in PHP, it can be helpful to refer to the official PHP documentation on regular expressions. Additionally, online resources such as regex101.com can be useful for testing and debugging regular expressions before implementing them in your PHP code. 

// Example code snippet using regular expressions in PHP
$pattern = '/[0-9]+/';
$string = 'abc123def456ghi';

if (preg_match($pattern, $string, $matches)) {
    echo 'Match found: ' . $matches[0];
} else {
    echo 'No match found';
}

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